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# Emscripten.cmake automatically enables 64-bit when the shell defines CMAKE_C_FLAGS="-sMEMORY64=1".
# This exposes a proper CMake option to switch b/w 32 and 64 bit.
option(VTK_WEBASSEMBLY_64_BIT "Enable support for 64-bit memory in wasm. Adds -sMEMORY64=1 compile and link flags." OFF)
if (VTK_WEBASSEMBLY_64_BIT)
# stick to what Emscripten.cmake does.
set(CMAKE_CROSSCOMPILING_EMULATOR "${CMAKE_CROSSCOMPILING_EMULATOR}" "--experimental-wasm-memory64")
set(CMAKE_LIBRARY_ARCHITECTURE "wasm64-emscripten")
set(CMAKE_SIZEOF_VOID_P 8)
set(CMAKE_C_SIZEOF_DATA_PTR 8)
set(CMAKE_CXX_SIZEOF_DATA_PTR 8)
else ()
# stick to what Emscripten.cmake does.
set(CMAKE_LIBRARY_ARCHITECTURE "wasm32-emscripten")
set(CMAKE_SIZEOF_VOID_P 4)
set(CMAKE_C_SIZEOF_DATA_PTR 4)
set(CMAKE_CXX_SIZEOF_DATA_PTR 4)
endif ()
option(VTK_WEBASSEMBLY_THREADS "Enable threading support in wasm. Adds -pthread compile and link flags." OFF)
option(VTK_WEBASSEMBLY_EXCEPTIONS "Enable exception support in wasm. Adds -fexceptions compile and link flags." OFF)
# wasm linking is already multithreaded. Here, we ensure targets are linked one at a time to avoid
# OOM errors and file lock contention.
if(CMAKE_GENERATOR MATCHES "Ninja")
set_property(GLOBAL APPEND PROPERTY JOB_POOLS wasm64_link_job_pool=1)
set(CMAKE_JOB_POOL_LINK wasm64_link_job_pool)
else ()
message(WARNING "Some targets may not link successfully! Job pooling is only available with Ninja generators.")
endif()
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